eeepc-laptop: disable cpu speed control on EeePC 701

[mirror_ubuntu-bionic-kernel.git] / kernel / kthread.c

diff --git a/kernel/kthread.c b/kernel/kthread.c
index ab7ae57773e1b41f263407eb4a3bad1c95b41289..fbb6222fe7e04d6dd863ea7975e70c4f3f78636d 100644 (file)
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -149,6 +149,29 @@ struct task_struct *kthread_create(int (*threadfn)(void *data),
 }
 EXPORT_SYMBOL(kthread_create);
 
+/**
+ * kthread_bind - bind a just-created kthread to a cpu.
+ * @p: thread created by kthread_create().
+ * @cpu: cpu (might not be online, must be possible) for @k to run on.
+ *
+ * Description: This function is equivalent to set_cpus_allowed(),
+ * except that @cpu doesn't need to be online, and the thread must be
+ * stopped (i.e., just returned from kthread_create()).
+ */
+void kthread_bind(struct task_struct *p, unsigned int cpu)
+{
+       /* Must have done schedule() in kthread() before we set_task_cpu */
+       if (!wait_task_inactive(p, TASK_UNINTERRUPTIBLE)) {
+               WARN_ON(1);
+               return;
+       }
+
+       p->cpus_allowed = cpumask_of_cpu(cpu);
+       p->rt.nr_cpus_allowed = 1;
+       p->flags |= PF_THREAD_BOUND;
+}
+EXPORT_SYMBOL(kthread_bind);
+
 /**
  * kthread_stop - stop a thread created by kthread_create().
  * @k: thread created by kthread_create().